IOS版本更新代码——商店版本

#define kStoreAppId @"1064298982"  //商店的苹果appid

-(void)checkAppUpdate
{
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        NSDictionary *infoDict = [[NSBundle mainBundle] infoDictionary];
        NSString *nowVersion = [infoDict objectForKey:@"CFBundleVersion"];
        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://itunes.apple.com/lookup?id=%@", kStoreAppId]];
        NSString * file =  [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
        NSLog(@"%@",file);
        dispatch_async(dispatch_get_main_queue(), ^{
            NSData *data = [file dataUsingEncoding:NSUTF8StringEncoding];
            NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
            if(((NSArray*)dic[@"results"]).count>0)
            {
                NSString *newVersion = [NSString stringWithFormat:@"%@",dic[@"results"][0][@"version"]];
                NSString *nowVersion2 = [nowVersion stringByReplacingOccurrencesOfString:@"." withString:@""];
                NSString *newVersion2 = [newVersion stringByReplacingOccurrencesOfString:@"." withString:@""];
                if([newVersion2 intValue]>[nowVersion2 intValue])
                {
                    NSString *newMsg = [NSString stringWithFormat:@"%@",dic[@"results"][0][@"releaseNotes"]];
                    NSString *newstr = [NSString stringWithFormat:@"有新版V%@",newVersion];
                    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:newstr message:newMsg delegate:self cancelButtonTitle:@"取消"otherButtonTitles:@"更新",nil];
                    [alert show];
                }
            }
        });
    });
}
- (void)alertView:(UIAlertView*)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if(buttonIndex==1)
    {
        // 此处加入应用在app store的地址，方便用户去更新，一种实现方式如下：
        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"https://itunes.apple.com/us/app/id%@?ls=1&mt=8", kStoreAppId]];
        [[UIApplication sharedApplication] openURL:url];
    }
}